Question

在我的应用中，我在文本视图中显示时间为07:00 PM。单击文本视图时，会弹出一个时间选择器对话框，在该时间选择器中，我必须显示与textview中显示的内容完全相同的时间。但是，我没有得到如何做到这一点。

代码

SimpleDateFormat sdf = new SimpleDateFormat("HH:mm a");
        //int hr = 0;
        Date date = null;
        try 
        {
            date = sdf.parse(resDateArray[3]);
        } 
        catch (ParseException e) {
            e.printStackTrace();
        }
        final Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        //tp is reference variable for time picker

        tp.setCurrentHour(calendar.get(Calendar.HOUR));
        tp.setCurrentMinute(calendar.get(Calendar.MINUTE));

        }//else

Answer 1

您应该使用SimpleDateFormat从Date获取String个对象。然后打电话

picker.setCurrentHour(date.getHours())

和

picker.setCurrentMinute(date.getMinutes())

由于不推荐使用Date对象，因此应使用Calendar代替它。您可以通过这种方式实例化Calendar：

Calendar c = Calendar.getInstance();
c.setTime(date);
picker.setCurrentHour(c.get(Calendar.HOUR_OF_DAY));
picker.setCurrentMinute(c.get(Calendat.MINUTE));

编辑：完整代码

        SimpleDateFormat sdf = new SimpleDateFormat("hh:ss");
        Date date = null;
        try {
            date = sdf.parse("07:00");
        } catch (ParseException e) {
        }
        Calendar c = Calendar.getInstance();
        c.setTime(date);

        TimePicker picker = new TimePicker(getApplicationContext());
        picker.setCurrentHour(c.get(Calendar.HOUR_OF_DAY));
        picker.setCurrentMinute(c.get(Calendar.MINUTE));

Answer 2

如果使用以下格式但没有使用timepicker小部件的人使用这个..

mStartTime.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            new TimePickerDialog(AddAppointmentActivity.this, onStartTimeListener, calendar
                    .get(Calendar.HOUR), calendar.get(Calendar.MINUTE), false).show();

        }
    });

TimePickerDialog.OnTimeSetListener onStartTimeListener = new OnTimeSetListener() {

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        String AM_PM;
        int am_pm;

        mStartTime.setText(hourOfDay + " : " + minute + "  " + AM_PM);
        calendar.set(Calendar.HOUR, hourOfDay);
        calendar.set(Calendar.MINUTE, minute);

    }
};

Answer 3

我已经创建了这个辅助函数来获取时间

        public static void showTime(final Context context, final TextView textView) {

    final Calendar myCalendar = Calendar.getInstance();
    TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            String am_pm = "";
            myCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
            myCalendar.set(Calendar.MINUTE, minute);
            if (myCalendar.get(Calendar.AM_PM) == Calendar.AM)
                am_pm = "AM";
            else if (myCalendar.get(Calendar.AM_PM) == Calendar.PM)
                am_pm = "PM";
            String strHrsToShow = (myCalendar.get(Calendar.HOUR) == 0) ? "12" : myCalendar.get(Calendar.HOUR) + "";
            //UIHelper.showLongToastInCenter(context, strHrsToShow + ":" + myCalendar.get(Calendar.MINUTE) + " " + am_pm);
            textView.setText(strHrsToShow + ":" + myCalendar.get(Calendar.MINUTE) + " " + am_pm);
        }
    };
    new TimePickerDialog(context, mTimeSetListener, myCalendar.get(Calendar.HOUR), myCalendar.get(Calendar.MINUTE), false).show();
}

以及如何以所需格式获取当前时间，我使用以下代码。 // PARAM日期是您要格式化的日期 // PARAM currentFormat的日期 // PARAM requiredFormat of date

    public static String getFormattedDate(String date, String currentFormate, String requiredFormate) {
    //SimpleDateFormat formatActual = new SimpleDateFormat("yyyy - MM - dd");
    if (date != null) {
        SimpleDateFormat formatActual = new SimpleDateFormat(currentFormate);
        Date dateA = null;
        try {
            dateA = formatActual.parse(date);
            System.out.println(dateA);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        //SimpleDateFormat formatter = new SimpleDateFormat("dd MMM, yyyy");
        SimpleDateFormat formatter = new SimpleDateFormat(requiredFormate);
        String format = formatter.format(dateA);
        System.out.println(format);
        return format;
    } else {
        return "";
    }

}

使用getFormattedDate是：

       String date = getFormattedDate(dateYouWantToFormate,"hh:mm a","hh:mm");

Answer 4

对于AM / PM，你必须为它实现一个逻辑，如下所示..所以你可以得到你提到的输出...只需尝试下面的代码......

int hr=tp.getCurrentHour();
String a="AM";
if(hr>=12){
    hr=hr-12;
    a="PM";
}
String tm=hr+":"+tp.getCurrentMinute()+" "+a;

Toast.makeText(MainActivity.this, tm, 500).show();

Answer 5

如果现在使用的是TimePicker，则最好不要使用Build版本，因为setCurrentHour和setCurrentMinute已被弃用。

SimpleDateFormat sdf = new SimpleDateFormat("hh:ss");
Date date = null;
try {
    date = sdf.parse("07:00");
} catch (ParseException e) {
}
Calendar c = Calendar.getInstance();
c.setTime(date);

TimePicker timePicker = new TimePicker(getApplicationContext());

if (Build.VERSION.SDK_INT >= 23) {
    timePicker.setHour(calculateHours());
    timePicker.setMinute(calculateMinutes());
}
else {
    timePicker.setCurrentHour(calculateHours());
    timePicker.setCurrentMinute(calculateMinutes());
}

Answer 6

sdk 23版之后有一些更改；

            SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");
            Date date = null;
            try {
                date = sdf.parse("12:02:32");
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if(date != null) {
                Calendar c = Calendar.getInstance();
                c.setTime(date);
                sleepTimeStartPicker.setHour(c.get(Calendar.HOUR_OF_DAY));
                sleepTimeStartPicker.setMinute(c.get(Calendar.MINUTE));
            }

Answer 7

在onTimeSet()函数中获取时间时必须牢记一个重要点，在日历实例中没有用于设置AM_PM的特殊函数。当我们设置时间AM_PM时，将自动进行相应的设置，就像如果在选择小时和分钟的同时选择了AM，则<calendarVariable>.get(Calendar.AM_PM)将返回0，而在相反情况下（对于PM）则返回1。

Android：使用文本视图中显示的时间设置时间选择器

7 个答案: